1 files changed, 70 insertions, 0 deletions
diff --git a/vendor/rustix/src/backend/linux_raw/net/netdevice.rs b/vendor/rustix/src/backend/linux_raw/net/netdevice.rs
new file mode 100644
index 00000000..d3c2a964
--- /dev/null
+++ b/vendor/rustix/src/backend/linux_raw/net/netdevice.rs
@@ -0,0 +1,70 @@
+//! Wrappers for netdevice ioctls.
+
+#![allow(unsafe_code)]
+
+use crate::backend::io::syscalls::ioctl;
+use crate::fd::BorrowedFd;
+use crate::io;
+use core::ptr::addr_of_mut;
+use core::{slice, str};
+use linux_raw_sys::ctypes::c_char;
+use linux_raw_sys::ioctl::SIOCGIFINDEX;
+#[cfg(feature = "alloc")]
+use linux_raw_sys::ioctl::SIOCGIFNAME;
+use linux_raw_sys::net::{ifreq, ifreq__bindgen_ty_1, ifreq__bindgen_ty_2, IFNAMSIZ};
+#[cfg(feature = "alloc")]
+use {alloc::borrow::ToOwned, alloc::string::String};
+
+pub(crate) fn name_to_index(fd: BorrowedFd<'_>, if_name: &str) -> io::Result<u32> {
+    let if_name_bytes = if_name.as_bytes();
+    if if_name_bytes.len() >= IFNAMSIZ as usize {
+        return Err(io::Errno::NODEV);
+    }
+    if if_name_bytes.contains(&0) {
+        return Err(io::Errno::NODEV);
+    }
+
+    // SAFETY: Convert `&[u8]` to `&[c_char]`.
+    let if_name_bytes = unsafe {
+        slice::from_raw_parts(if_name_bytes.as_ptr().cast::<c_char>(), if_name_bytes.len())
+    };
+
+    let mut ifreq = ifreq {
+        ifr_ifrn: ifreq__bindgen_ty_1 { ifrn_name: [0; 16] },
+        ifr_ifru: ifreq__bindgen_ty_2 { ifru_ivalue: 0 },
+    };
+    unsafe { ifreq.ifr_ifrn.ifrn_name[..if_name_bytes.len()].copy_from_slice(if_name_bytes) };
+
+    unsafe { ioctl(fd, SIOCGIFINDEX, addr_of_mut!(ifreq).cast()) }?;
+    let index = unsafe { ifreq.ifr_ifru.ifru_ivalue };
+    Ok(index as u32)
+}
+
+#[cfg(feature = "alloc")]
+pub(crate) fn index_to_name(fd: BorrowedFd<'_>, index: u32) -> io::Result<String> {
+    let mut ifreq = ifreq {
+        ifr_ifrn: ifreq__bindgen_ty_1 { ifrn_name: [0; 16] },
+        ifr_ifru: ifreq__bindgen_ty_2 {
+            ifru_ivalue: index as _,
+        },
+    };
+
+    unsafe { ioctl(fd, SIOCGIFNAME, addr_of_mut!(ifreq).cast()) }?;
+
+    if let Some(nul_byte) = unsafe { ifreq.ifr_ifrn.ifrn_name }
+        .iter()
+        .position(|ch| *ch == 0)
+    {
+        let ifrn_name = unsafe { &ifreq.ifr_ifrn.ifrn_name[..nul_byte] };
+
+        // SAFETY: Convert `&[c_char]` to `&[u8]`.
+        let ifrn_name =
+            unsafe { slice::from_raw_parts(ifrn_name.as_ptr().cast::<u8>(), ifrn_name.len()) };
+
+        str::from_utf8(ifrn_name)
+            .map_err(|_| io::Errno::ILSEQ)
+            .map(ToOwned::to_owned)
+    } else {
+        Err(io::Errno::INVAL)
+    }
+}